Downloading an e-book for free

Q: If any author kept his book (not Deeni) on certain rate to download online (book for sale), the same book I get from another source some other guy downloaded before and posted on his site or from torrent. Is it ok to download that books and read it and get knowledge from it and it helps for my career. If the author is dead and the caretaker selling the book online. Can I download it from another source, I don't know weather they buy or just download it illegally and posting it for free.

Making a vow in one's heart

Q:

1. I made an intention that if there is a certain outcome I will give money in Sadaqah, the outcome occurred, is it permissible to use the money to pay for the postage of clothes parcel to relatives in India?

2. If it isn't permissible where can I give the Sadaqah money (what can the Sadaqah money be used for)?

Not revealing one's suppliers to others

Q: I am a work from home Muslimah and have a very small business. I have a few other ladies selling for me. My profit per item is half or sometimes less then half of what I pay per item. (To be honest I make R10 profit per item) so the person selling can also add a small profit or I pay them a certain percentage on sales made. Some people selling for me asked me where they can buy this items to sell for themselves. Is it wrong of me not to tell them cause knowing and believing that Allah Ta'ala gives rizik? I also feel burdened not telling them.