; (ii) to prevent embarrassment to a person, organization, or agency; (iii) to restrain competition; or (iv) to prevent or delay the release of information that does not require protection in the interest of national security. (B) Basic scientific research Basic scientific research information not clearly related to national security shall not be classified. (C) Reclassification Information may not be reclassified after being declassified and release to the public under proper authority unless personally approved by the President based on a determination that such reclassification is required to prevent significant and demonstrable damage to national security; (d) Declassification of information classified under Act (1) In general No information may remain classified indefinitely. (2) Maximum period of classification Except as provided in paragraphs (3), (4), and (5), information may not remain classified under this title after the date that is 25 years after the date of the original classification of the information. (3) Earlier declassification When classifying information under this title, an agency official may provide for the declassification of the information as of a date or event that is earlier than the date otherwise provided for under paragraph (2). (4) Later declassification When classifying information under this title, an agency official may provide for the declassification of the information on the date that is 50 years after the date of the classification if the head of the agency— (A) determines that there is no likely set of circumstances under which declassification would occur within the time otherwise provided for under paragraph (2); (B) (i) obtains the concurrence of the director of the Information Security Oversight Office in the determination; or (ii) seeks but is unable to obtain concurrence under clause (i), obtains the concurrence of the President