Is it permissible to benefit from study material notes available in PDF format online, or to print them outside the library that sells them at a high price?

The relied-upon fatwa is the impermissibility of copying books, lectures, and the like without the permission of their owners. However, some scholars permit it if it is for personal benefit and not for commercial gain. So, if you need to benefit from them and find it difficult to purchase them, then there is no blame upon you in adopting this opinion.