法令翻訳 http://www.japaneselawtranslat...amp;page=5

(特定の株主からの取得に関する定款の定め)
第百六十四条   株式会社は、株式（種類株式発行会社にあっては、ある種類の株式。次項において同じ。）の取得について第百六十条第一項の規定による決定をするときは同条第二項及び第三項の規定を適用しない旨を定款で定めることができる。

Provisions of Articles of Incorporation Regarding Acquisition from Specific Shareholders
Article 164   If a Stock Company intends to make a determination under the provisions of Article 160, paragraph (1) with respect to the acquisition of shares (or, for a Company with Class Shares, shares of a certain class; the same applies in the following paragraph), it may provide in the articles of incorporation to the effect that the provisions of paragraph (2) and paragraph (3) of that Article do not apply.

株式の発行後に定款を変更して当該株式について前項の規定による定款の定めを設け、又は当該定めについての定款の変更（同項の定款の定めを廃止するものを除く。）をしようとするときは、当該株式を有する株主全員の同意を得なければならない。

If, after the shares are issued, it is intended to create a provision in the articles of incorporation under the provisions of the preceding paragraph with respect to such shares by amending the articles of incorporation, or to effect any amendment (excluding that which abolishes the provisions of the articles of incorporation under that paragraph) in the articles of incorporation with respect to such provisions, the consent of all shareholders who hold such shares must be obtained.