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You can't grant or license that which is not yours. For example, the Slack terms of service say: We grant to Customer a non-sublicensable, non-transferable, non-exclusive, limited license for Customer and its Authorized Users to use the object code version of these components, but solely as necessary to use the Services and in accordance with the Contract ...


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You have copyright in the code you write automatically, from the moment you write it (you don't specify a jurisdiction, but this is true pretty much everywhere). Copyright notices are placed to put any reader on notice of this fact, and to provide them with information about who owns the copyright. Once you have written the code you can allow others to copy ...


1

It is quite possible that whoever plays the video needs a license to do so. If you buy a Windows PC, a Mac, an Android phone or an iPhone, the manufacturer or the provider of the OS has paid for that license. But you need to check that. For example, MacOS doesn't come with a license that allows end users and applications to convert music to .mp3 format (...


1

There, actually, is an official answer to your question You should put a notice at the start of each source file, stating what license it carries, in order to avoid risk of the code's getting disconnected from its license. If your repository's README says that source file is under the GNU GPL, what happens if someone copies that file to another program? ...


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