- image에 watermark 넣기
https://github.com/purab/SpringBoot-upload-image-resize-watermark-tutorialhttps://handcoding.tistory.com/148
https://blog.conholdate.com/ko/total/add-watermark-to-images-using-java/
https://blog.groupdocs.com/ko/watermark/add-watermark-to-images-in-java/
- pdf에 watermark 넣기
https://www.baeldung.com/java-watermarks-with-itext
Using Watermarks with iText in Java | Baeldung
Learn how to add watermarks to generated PDF and to an existing PDF using iText.
www.baeldung.com
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