This is a grey area. Nawa e Saliheen is widely considered a "mass reprint" book. Many Islamic Dawah organizations distribute it for free as Sadaqah Jariyah (ongoing charity). However, if the PDF removes publisher copyrights or contains printing errors, it is discouraged.
Special prayers and actions to be performed after obligatory Namaz (prayers). Duas (Supplications): nawa e saliheen book pdf
Would you like a shorter version for a bookstore or social media comment? This is a grey area