Naming a product using the first letter of a persons name? I was thinking about naming our products using the first letter in a cause or person that we'd like to bring attention to. For our first product I was thinking FS R, with the last letter being the first letter in the name Razia Jan. I'd choose her based on her humanitarian efforts in Afghanistan. Do we run into any copyright or other legal issues for linking the product name to something like this that promotes global awareness?
Do you have permission of the person? In general, product names fall under trademark law, not copyright. And while it's possible to use the name of a non-employee as a trademark, doing so without the permission of that person is rather dangerous. That person may sue you for a number of different reasons, with different demands - chiefly financial compensation or a rename of your product.
Disclaimer: I'm from the US and don't claim to know German or Turkish law. So let me discuss some general principles here, but details may well be different in Germany and Turkey. You're mixing together three very different things: trademark, copyright, and patent. Copyright protects the expression of an idea, in this case, the exact computer code, images, etc. If you didn't copy his code, the chance that you would coincidentally write identical code is remote. The fact that you both have a line of code that says x=x+1 wouldn't give him any grounds for a lawsuit. He'd have to show substantial portions of the code were identical. If you didn't deliberately copy his code, this isn't going to happen. Barring some extraordinary and unbelievable coincidence, you can't violate copyright accidentally. Trademark protects names and symbols used to identify a company or a product. If you decided to call your software company "Microsoft", then that other Microsoft could sue you for trademark infringement. Likewise if you copied somebody else's logo or other distinctive graphics. This is very different from copyright. It is quite possible to violate someone's trademark accidentally. Especially if he gave his company or product a rather generic name. Like if someone called his product, say, "Password Manager", someone else might make a product with the same name without ever having heard of the original. Ditto if he has some simple logo or other graphics. If you did accidentally duplicate a name or graphic elements, well, in the US a court would likely order you to change your name or graphics and that would be the end of it, unless you refused, in which case you'd end up in court. US Courts have ruled that very generic names have limited trademark protection. An example I saw recently was "Main Street Auto Repair". A court said that the owner of that name could prevent someone else from opening a shop in the same town with the same name, but he couldn't sue someone in another town who happened to use the same name. This is why, by the way, companies often use made-up words for their product names. In your case, this should be a trivial issue. If he is claiming trademark to the look of the main menu screen, just change the colors or move some buttons around. If it actually went to court, you should be able to argue that the similarity was accidental and when you were informed you promptly changed it, and that should be the end of it. Depending, I guess, on how hard-nosed the judge is, etc. Patents are different still. A patent gives the owner the exclusive right to use an invention or process for a specified period of time. It doesn't matter if you invented the same thing entirely independently. Whoever filed the patent first has exclusive rights. There have been cases where an inventor lost out to someone with a similar invention because he submitted his patent application one day later. If this other person has patents that you are infringing, you are pretty much out of luck.
It doesn't make a difference if the product is free or commercial use, if it's initiated by a company or an individual. What you are considering would be a &quot;derivative work&quot; and without explicit permission from the copyright holder, it is considered a violation.
I was told that when you sign something in the UK, then it is your signature, no matter what name you are using. So if you sign a contract with my name, then it's your signature and you are bound by the contract. Things might be invalid because you signed and not me. For example, if you sign a contract selling my car in my name, then that contract is not valid. If some document needs signatures of two witnesses, and you sign with your name, then with my name, then there are no two signatures. As far as I know, signing under a false name is not in itself criminal, but might very well be supporting fraud, for example, and might therefore be illegal. The contract for the sale of my car, signed by you using my name, would very likely be part of fraud and therefore criminal.
There is already any number of other pages that are named kleinanzeigen, just with different top level domains (probably sprung into existence after the plan for the renaming became public). But if you are a Website operating in Germany that owns the kleinanzeigen.de domain, that probably does not worry you too much (you could probably fight others over the use of the word for a specific purpose such as a classifieds website, because sometimes specific uses might be protected; but that would be an uphill battle, since as pointed out the name is the literal description of the business model). What might worry you is that somebody is tricked into confusing kleinanzeigen.eu or kleinanzeigen.biz with your valuable property. The way to avoid that is to register a &quot;Wort-Bild-Marke&quot;, a combination of your name with one or more distinctive graphic elements. You will notice that the &quot;kleinanzeigen&quot; name on the website is rendered in a specific font and is preceded by what on closer inspection turns out to be a stylized letter &quot;k&quot;. That is something that can be protected by law. Nobody else is allowed to be too close to that design, so that minimizes the danger that visitors confuse a competitor's page with the &quot;original&quot; kleinanzeigen page. Since the question alludes to eBay's business, kleinanzeigen is no longer a part of eBay - for some three years now they belong to Adevinta, a Norwegian conglomerate that runs classified portals in various countries. So keeping &quot;ebay&quot; in their name was not really an option (and all alternatives to &quot;kleinanzeigen&quot; were probably worse).
Fairly easily. You want to use their API. They give you the conditions for using it. As long as their conditions aren't illegal or unreasonable, you need to adhere to them to use their API. Is it illegal to not include "insta", "gram", or "instagram" in your company or product name? Almost certainly not. Is it an unreasonable term? Almost certainly not. If you want to include "insta", "gram", or "instagram" in your company or product name, you can try - but you can't then use their API.
Being or not being open source makes fairly little difference in trademark law. If a commercial firm (Yoyodyne, say) had used the name &quot;Portable Network Graphics&quot; and the abbreviation &quot;PNG&quot; in trade, and taken such further steps as would be needed to protect it in the relevant countries, that firm would have a protectable trademark. Note that in some countries, a trademark must be registered to have any protection at all (much of the EU follows this rule). In others, use in commerce can offer some protection even without registration (the US follows this rule). Had this happened (in an alternate reality) Yoyodyne could have sent a cease and desist letter when open source developers started using the mark. If the devs did not cease, Yoyodyne might have obtained an injunction, or damages for trademark infringement, or both. They could also have issued a takedown notie to the site hosting the project. But had Yoyodyne failed to defend the mark effectively and allowed it to become generic, Yoyodyne might have lost all rights to it. Also, had Yoyodyne ceased to use it in trade for a significant period, they might have lost rights. This is a place where the different laws in different countries might lead to different results. Note that &quot;Portable Network Graphics&quot; is rather descriptive, and not particularly distinctive. Descriptive marks, like &quot;Tasty Pizza&quot; generally get weaker protection, while more distinctive marks, such as &quot;LuAnn's Tastee Pizza&quot; are more strongly protected, in general. Again this depends on the country, and the specific facts. In general the first to use, or to register a mark, gets the rights. When one entity is the first to use, but a different one is first to register, things can get confusing, and results will be different in different countries. Note that a Cease and Desist letter is not a legal requirement. It is a threat of possible future legal action, and often an offer to avoid such action if the recipient does as the sender requests. The recipient can comply with the letter, wait for court action, or try to make some sort of compromise deal. Open source projects, as other answers suggest, often choose to comply.
&quot;Swiss Army Knife&quot; is indeed a trademark. Indeed, it is a very special trademark, because after the last of the Geneva Conventions was adopted, the use of the Swiss insignia used in the Swiss Army Knife's trademarked logo was prohibited except for grandfathered trademarks such as the one you identify. But use of a trademark is infringing only when it is used in connection with the sale of a good or service to imply that the good or service sold is endorsed by or affiliated with the owner of the trademark. In the context you describe, the trademark is not being used in that fashion, and so it is not infringing.