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Imagine I write a piece of software, which uses some MIT-licensed library. Let's assume that I modified that library.

My software (of which that library is part) produces some content, which I sell at a profit. I do not sell or publish my software.

Am I allowed to do this?

When I sell my content, do I need to include a notice "This content was created using library X" ?

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Open source licenses deal with redistribution and don't impose restrictions on merely using open source software.

Regarding a requirement to post a notice that you used the library, this is paraphrased from the GNU GPL FAQ:

Copyright law does not give the license grantor
any say in the use of the output people make from their data using
their program. If the user uses their program to enter or convert his
own data, the copyright on the output belongs to him, not to the license
grantor.

While this talks about the GPL, it's relevant to any copyrighted software. You aren't required to include a notice, if the license doesn't say so. The MIT license imposes no such restriction, so you don't have to include a notice that you used the library.

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