Are there any freely available books you would recommend for 2024 security in software engineering? (Freely available in the same sense that the SWEBOK is I me

Are there any freely available books you would recommend for 2024 security in software engineering? (Freely available in the same sense that the SWEBOK is I mean; you can read it free of charge without DRM and without having to resort to piracy. Doesn't have to be a fully free book that goes as far as to allow modification and redistribution although that is an extra nice bonus if any of your suggested books are like that.)