However, if you store it in a physical location such as your office drawer, and someone has possession of this seedphrase and has sufficient knowledge of the importance of this information, they could act maliciously and steal your money. A commonly used solution to avoid this problem would be to encrypt the seedphrase and there are several methods and some of them vary in security i.e some users encrypt a seedphrase with aes, gpg, compression tools like winrar, 7zip protected by passwords (I've done this a lot in the past) and also with
BIP39 Passphrase.
BIP39 passphrase is not encryption, it is word extension. You extend the word with the 13th, 16th, 19th, 22nd or 25th word, depending on the number of word your seed phrase is. I prefer the lazy way which is the use of passphrase to extend the word. If a good passphrase that is long is used, to brute force the passphrase will be hard.