A lien in favor of an issuer upon a certificated security is valid against a purchaser only if the right of the issuer to the lien is noted conspicuously on the security certificate.
Del. Code tit. 6, §§ 8-209
Issuer’s lien
5A Del
Official source: Delaware Code Online. Reproduced from public-domain Delaware statutes; confirm against the official source for the current text. Not legal advice.